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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80130fd03645fad93463b12d75c03e1a944d7580d99ade584a86cb0de1d93c99' 
  AND token = '1Iq/AhBbGuEWYNMK9tUbIMoBsQ/v/amTRRp9Rc2+nP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}